Add CJK codecs support as discussed on python-dev. (SF #873597)
Several style fixes are suggested by Martin v. Loewis and
Marc-Andre Lemburg. Thanks!
diff --git a/Modules/cjkcodecs/_johab.c b/Modules/cjkcodecs/_johab.c
new file mode 100644
index 0000000..3aeb500
--- /dev/null
+++ b/Modules/cjkcodecs/_johab.c
@@ -0,0 +1,223 @@
+/*
+ * _johab.c: the Johab codec
+ *
+ * Written by Hye-Shik Chang <perky@FreeBSD.org>
+ * $CJKCodecs: _johab.c,v 1.3 2003/12/31 05:46:55 perky Exp $
+ */
+
+#include "codeccommon.h"
+
+ENCMAP(cp949)
+DECMAP(ksx1001)
+
+static const unsigned char u2johabidx_choseong[32] = {
+ 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+ 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+ 0x10, 0x11, 0x12, 0x13, 0x14,
+};
+static const unsigned char u2johabidx_jungseong[32] = {
+ 0x03, 0x04, 0x05, 0x06, 0x07,
+ 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+ 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+ 0x1a, 0x1b, 0x1c, 0x1d,
+};
+static const unsigned char u2johabidx_jongseong[32] = {
+ 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+ 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
+ 0x10, 0x11, 0x13, 0x14, 0x15, 0x16, 0x17,
+ 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d,
+};
+static const DBCHAR u2johabjamo[] = {
+ 0x8841, 0x8c41, 0x8444, 0x9041, 0x8446, 0x8447, 0x9441,
+ 0x9841, 0x9c41, 0x844a, 0x844b, 0x844c, 0x844d, 0x844e, 0x844f,
+ 0x8450, 0xa041, 0xa441, 0xa841, 0x8454, 0xac41, 0xb041, 0xb441,
+ 0xb841, 0xbc41, 0xc041, 0xc441, 0xc841, 0xcc41, 0xd041, 0x8461,
+ 0x8481, 0x84a1, 0x84c1, 0x84e1, 0x8541, 0x8561, 0x8581, 0x85a1,
+ 0x85c1, 0x85e1, 0x8641, 0x8661, 0x8681, 0x86a1, 0x86c1, 0x86e1,
+ 0x8741, 0x8761, 0x8781, 0x87a1,
+};
+
+ENCODER(johab)
+{
+ while (inleft > 0) {
+ Py_UNICODE c = IN1;
+ DBCHAR code;
+
+ if (c < 0x80) {
+ WRITE1(c)
+ NEXT(1, 1)
+ continue;
+ }
+ UCS4INVALID(c)
+
+ RESERVE_OUTBUF(2)
+
+ if (c >= 0xac00 && c <= 0xd7a3) {
+ c -= 0xac00;
+ code = 0x8000 |
+ (u2johabidx_choseong[c / 588] << 10) |
+ (u2johabidx_jungseong[(c / 28) % 21] << 5) |
+ u2johabidx_jongseong[c % 28];
+ } else if (c >= 0x3131 && c <= 0x3163)
+ code = u2johabjamo[c - 0x3131];
+ else TRYMAP_ENC(cp949, code, c) {
+ unsigned char c1, c2, t2;
+ unsigned short t1;
+
+ assert((code & 0x8000) == 0);
+ c1 = code >> 8;
+ c2 = code & 0xff;
+ if (((c1 >= 0x21 && c1 <= 0x2c) || (c1 >= 0x4a && c1 <= 0x7d))
+ && (c2 >= 0x21 && c2 <= 0x7e)) {
+ t1 = (c1 < 0x4a ? (c1 - 0x21 + 0x1b2) : (c1 - 0x21 + 0x197));
+ t2 = ((t1 & 1) ? 0x5e : 0) + (c2 - 0x21);
+ OUT1(t1 >> 1)
+ OUT2(t2 < 0x4e ? t2 + 0x31 : t2 + 0x43)
+ NEXT(1, 2)
+ continue;
+ } else
+ return 1;
+ } else
+ return 1;
+
+ OUT1(code >> 8)
+ OUT2(code & 0xff)
+ NEXT(1, 2)
+ }
+
+ return 0;
+}
+
+#define FILL 0xfd
+#define NONE 0xff
+
+static const unsigned char johabidx_choseong[32] = {
+ NONE, FILL, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05,
+ 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d,
+ 0x0e, 0x0f, 0x10, 0x11, 0x12, NONE, NONE, NONE,
+ NONE, NONE, NONE, NONE, NONE, NONE, NONE, NONE,
+};
+static const unsigned char johabidx_jungseong[32] = {
+ NONE, NONE, FILL, 0x00, 0x01, 0x02, 0x03, 0x04,
+ NONE, NONE, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a,
+ NONE, NONE, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10,
+ NONE, NONE, 0x11, 0x12, 0x13, 0x14, NONE, NONE,
+};
+static const unsigned char johabidx_jongseong[32] = {
+ NONE, FILL, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
+ 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
+ 0x0f, 0x10, NONE, 0x11, 0x12, 0x13, 0x14, 0x15,
+ 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, NONE, NONE,
+};
+
+static const unsigned char johabjamo_choseong[32] = {
+ NONE, FILL, 0x31, 0x32, 0x34, 0x37, 0x38, 0x39,
+ 0x41, 0x42, 0x43, 0x45, 0x46, 0x47, 0x48, 0x49,
+ 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, NONE, NONE, NONE,
+ NONE, NONE, NONE, NONE, NONE, NONE, NONE, NONE,
+};
+static const unsigned char johabjamo_jungseong[32] = {
+ NONE, NONE, FILL, 0x4f, 0x50, 0x51, 0x52, 0x53,
+ NONE, NONE, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
+ NONE, NONE, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
+ NONE, NONE, 0x60, 0x61, 0x62, 0x63, NONE, NONE,
+};
+static const unsigned char johabjamo_jongseong[32] = {
+ NONE, FILL, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
+ 0x37, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
+ 0x40, 0x41, NONE, 0x42, 0x44, 0x45, 0x46, 0x47,
+ 0x48, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, NONE, NONE,
+};
+
+DECODER(johab)
+{
+ while (inleft > 0) {
+ unsigned char c = IN1, c2;
+
+ RESERVE_OUTBUF(1)
+
+ if (c < 0x80) {
+ OUT1(c)
+ NEXT(1, 1)
+ continue;
+ }
+
+ RESERVE_INBUF(2)
+ c2 = IN2;
+
+ if (c < 0xd8) {
+ /* johab hangul */
+ unsigned char c_cho, c_jung, c_jong;
+ unsigned char i_cho, i_jung, i_jong;
+
+ c_cho = (c >> 2) & 0x1f;
+ c_jung = ((c << 3) | c2 >> 5) & 0x1f;
+ c_jong = c2 & 0x1f;
+
+ i_cho = johabidx_choseong[c_cho];
+ i_jung = johabidx_jungseong[c_jung];
+ i_jong = johabidx_jongseong[c_jong];
+
+ if (i_cho == NONE || i_jung == NONE || i_jong == NONE)
+ return 2;
+
+ /* we don't use U+1100 hangul jamo yet. */
+ if (i_cho == FILL) {
+ if (i_jung == FILL) {
+ if (i_jong == FILL)
+ OUT1(0x3000)
+ else
+ OUT1(0x3100 | johabjamo_jongseong[c_jong])
+ } else {
+ if (i_jong == FILL)
+ OUT1(0x3100 | johabjamo_jungseong[c_jung])
+ else
+ return 2;
+ }
+ } else {
+ if (i_jung == FILL) {
+ if (i_jong == FILL)
+ OUT1(0x3100 | johabjamo_choseong[c_cho])
+ else
+ return 2;
+ } else
+ OUT1(0xac00 +
+ i_cho * 588 +
+ i_jung * 28 +
+ (i_jong == FILL ? 0 : i_jong))
+ }
+ NEXT(2, 1)
+ } else {
+ /* KS X 1001 except hangul jamos and syllables */
+ if (c == 0xdf || c > 0xf9 ||
+ c2 < 0x31 || (c2 >= 0x80 && c2 < 0x91) ||
+ (c2 & 0x7f) == 0x7f ||
+ (c == 0xda && (c2 >= 0xa1 && c2 <= 0xd3)))
+ return 2;
+ else {
+ unsigned char t1, t2;
+
+ t1 = (c < 0xe0 ? 2 * (c - 0xd9) : 2 * c - 0x197);
+ t2 = (c2 < 0x91 ? c2 - 0x31 : c2 - 0x43);
+ t1 = t1 + (t2 < 0x5e ? 0 : 1) + 0x21;
+ t2 = (t2 < 0x5e ? t2 : t2 - 0x5e) + 0x21;
+
+ TRYMAP_DEC(ksx1001, **outbuf, t1, t2);
+ else return 2;
+ NEXT(2, 1)
+ }
+ }
+ }
+
+ return 0;
+}
+#undef NONE
+#undef FILL
+
+#include "codecentry.h"
+BEGIN_CODEC_REGISTRY(johab)
+ MAPOPEN(ko_KR)
+ IMPORTMAP_DEC(ksx1001)
+ IMPORTMAP_ENC(cp949)
+ MAPCLOSE()
+END_CODEC_REGISTRY(johab)